/// The 9-byte header that prefixes every Maven Central index stream.
////// The version byte is currently always `0x01`. The timestamp is milliseconds
/// since the Unix epoch; the on-wire sentinel `-1` is mapped to `None`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]#[cfg_attr(feature ="serde",derive(serde::Serialize))]#[non_exhaustive]pubstructIndexHeader{/// Format version byte; currently always `0x01`.
pubversion:u8,
/// Index-build timestamp in milliseconds since the Unix epoch; `None` when
/// the on-wire sentinel `-1` is present.
pubtimestamp_millis:Option<i64>,
}